diff --git a/modules/ppcp-api-client/src/Helper/Cache.php b/modules/ppcp-api-client/src/Helper/Cache.php
index e31dd14a3..c5b79dc5c 100644
--- a/modules/ppcp-api-client/src/Helper/Cache.php
+++ b/modules/ppcp-api-client/src/Helper/Cache.php
@@ -67,10 +67,11 @@ class Cache {
 	 *
 	 * @param string $key The key under which the value should be cached.
 	 * @param mixed  $value The value to cache.
+	 * @param int    $expiration Time until expiration in seconds.
 	 *
 	 * @return bool
 	 */
-	public function set( string $key, $value ): bool {
-		return (bool) set_transient( $this->prefix . $key, $value );
+	public function set( string $key, $value, int $expiration = 0 ): bool {
+		return (bool) set_transient( $this->prefix . $key, $value, $expiration );
 	}
 }
diff --git a/modules/ppcp-onboarding/src/Render/OnboardingRenderer.php b/modules/ppcp-onboarding/src/Render/OnboardingRenderer.php
index ad795673d..88091d606 100644
--- a/modules/ppcp-onboarding/src/Render/OnboardingRenderer.php
+++ b/modules/ppcp-onboarding/src/Render/OnboardingRenderer.php
@@ -103,7 +103,7 @@ class OnboardingRenderer {
 		$url = $is_production ? $this->production_partner_referrals->signup_link( $data ) : $this->sandbox_partner_referrals->signup_link( $data );
 		$url = add_query_arg( $args, $url );
 
-		$this->cache->set( $environment . '-' . $product, $url );
+		$this->cache->set( $environment . '-' . $product, $url, 3 * MONTH_IN_SECONDS );
 
 		return $url;
 	}